<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            height: 100vh;
        }
        header,footer{
            position: absolute;
            left: 0;
            width: 100%;
            height: 50px;
            background-color: chartreuse;
        }
        header{
            top: 0;
            z-index: 99;
        }
        footer{
            bottom: 0;
            z-index: 99;
        }
        main{
            position: absolute;
            width: 100%;
            margin: 50px 0;
            height: calc(100vh- 50px - 50px);
            background-color: chocolate;
        }
       
    </style>
</head>
<body>
    <header></header>
    <main>
        <div class="left">
            <h1>1</h1>
            <h1>2</h1>
            <h1>3</h1>
            <h1>4</h1>
            <h1>5</h1>
            <h1>6</h1>
            <h1>7</h1>
            <h1>8</h1>
            <h1>9</h1>
            <h1>10</h1>
        </div>
        <div class="right"></div>
    </main>
    <footer></footer>
</body>
</html>